Plaster board



H. 1:. HANrsoN PLASTER BOARD Original Filed Oct. 30. 1925 Dec 6, 1927.

Patented Dec. 6, 1927. I'

t j IED STATES PATENT OFFICE.

HANS E. HANSON, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR 0F ONIil-lf-IALE` T0 ANDREW E. CARLSEN, OF MINNEAPOLIS, MINNESOTA.

PLASTER BOARD.

HEISSUED Application led October 30, 1925, Serial No. 65,772. Renewed January 27, 1927.

This invention relates to the art of building, and the primary object is to provide an improved construction of plastered Wall, wherein the plaster is carried by a plaster base, which in turn is carried or supported by studdings or other means forming the rigid or central portion ofrthe Wall. A second object is to provide an improved, practical, and eflcient form of plaster base, the same consisting of a series of panels or boards having roughened outer surfaces, to which the vapplied plaster will cling, and which are so constructed that they will tend to support or brace each other while in their permanent positions in the wall. Further and more specific objects will be disclosedv in the course of the following specification, reference being had to the accompanying drawing, wherein-z Fig. l is'a` perspective view of an upper corner portion of a room, showing the construction of the improved wall and the application of `my improved plaster base.

Fig. 2 is an enlarged detail perspective view of one of my improved lplaster boards, the board here shown also illustrating a modiicatiom of the construction shown in Fig. 1.

Fig. 3 is an enlarged detail section on either of the lines 3-3 in Fig. l.

Referring to the drawing more particularly and by reference characters A designates the ceiling of a room having wallsB and C. The ceiling A and wall C are shown as fully plastered, while the wall B is only partly covered by plaster 4, so as to expose and illustrate my wall base structure, which is made up of boards or panels D, the same being nailed or otherwise suitably secured to the usual studdings E of the wall.

lAlthough each board D is formed of a single piece of material, it presents the appearance of two rectangular sections or panels, one of which is diagonally offset fromr the other, with a result that the board or entire panel has an upwardly projecting rear flange 5, a correspon-ding rear end `flange 6, and two opposed butV front flanges 7 and 8. As shown in Fig. .3 the flange I6 of one board is longer than the flange 8 of the adjacent board, so as to leave a space or groove 9 when the boards are placed end to end. Similarly, the flange 7 is narrower than the flange 5, so as to leave a horizontal channel .1.0 between adjacent tiers of boards.

It may also be noted that the total thicknesses of the flanges 6 and 8, or 5 and 7, is less than the thickness of a board, so that, in addition to the channel 9 (or 10) there will he left a space 11, between the overlapping flanges, so that the opening 9-11 will be substantially L-shaped in cross section, and as such will form very eiicient keys 4a in the plaster 4. l/Vhen the boards are made in large sizes it is found very desirable' to provide them with channels or grooves l2 in their faces, as shown in Fig. 2, which channels are similar in many respects to the grooves or spaces 9 and 10.

In constructing plaster board bases, as a substitute for the more expensive and slower method of lathing, it has been the custom to use plain sheets of the board, and preferably in large sizes,`for convenience in applying, and such boards have been cut so as to meet, or substantiallymeet, at the studding centers, and at such ends were nailed to the studdings. They have no overlapping ianges at either ends or top and bot-tom and therefore the vertical edges, at least, must end at and be secured to the permanent upright'. Consequently, as the studding centers will seldom correspond with'the horizontal dimensions of the boards, it'is necessary to saw off the projecting ends, resulting in a great loss of material. Furthermore, if the tit of a board is tight or close an ordinary workman will seldom take the trouble to cut off enough to allow for an expansion space between the ends of the boards, with a result that as the 'outer surfaces of the boards become wet from the plaster, as the latter is applied, the entire wall will bulge and swell at least between the studdings, and such swelling is not only unsightly but may be very destructive, and require remaking the entire wall.

To overcome these and other difficulties and objections I have perfected the plaster thel offset or staggered condition of thel As the boards are comparatively small, or if large are provided with the channels 12, the spaces 9, 10 and 12 are suflicient to prevent any noticeable swelling by "moisture, especially as such moisture as is absorbed from the plaster is limited to a shallow depth immediately adjacent to the outer or roughcned surface of the boards. Furthermore plaster keys 4 insures the retention of the dried plaster sheet to the entire wall and thoroughly fills all the spaces between the adjacent boar/ds. Incidentally the overlapping flange arrangement insures a thorough insulation against the transmission of heat through the joints of the wall.

It may here be noted that while substantial swelling or bulging of a wall,`by reason of moisture passing from the plaster into `the base, is objectionable, it is not objectionable, but is, on the other hand, desirable, if not necessary, that the base will absorb such moisture, because that very process greatly assists in setting the plaster, and

' permits a heavier coat of plaster to be applied than if the -hase were non-porous. Furthermore, a non-porous or non-moistureabsorbable base would no doubt lbe so hard that it could not be penetrated by or secured 1. A plaster base comprising la series of panels adapted to be arranged adjacent to of plaster applied to the base, each of said each other in the same plane and having roughened outer surfaces for holding a sheet panels being provided at opposite edges with l 2. In a wall, a series of adjoining boards having roughened plaster receiving surfaces, the adjoining ends of each two of said boards having overlapping anges, the total thiclc ness of said overlapping anges being less than the thickness of one of the boards.

3. In a wall, a plurality of adjoining rectangular moisture absorbable plaster boards having plaster adhering faces, a coat of plaster adhering to the faces, overlapping flanges extending from the edges of said boards, the opposite flanges of each board being of different widths, so asv to form plaster key forming recesses.

4:. In a structure of the character described, a wall, plaster covering the wall, said wall having a plaster adhering surface and horizontal and vertical channels in its outer face, whereby keys of said plaster will be formed in said channels, said channels being angularly formed whereby said keys will be substantiallyL-shaped in cross section.

5. In a structure `of the lcharacter de-. scribed, a wall, plaster covering the wall, said wall having a plaster adhering surface and horizontal and vertical channels in its outer face, whereby keys of said plaster will be formed in said channels, said wall comprising tiers of panels placed end to end in staggered relations with respect to the panels above and below, and the adjoining edges of all of said panels being provided with overlapping flanges, one each 'of which flanges is wider than that which it overlaps.

In testimony whereof I affix my signature.

HANS E. Hanson. 

